导读：As there is less and less coal and oil,scientists are explor As there is less and less coal and oil,scientists are exploring new ways of making use of ______ energy,such as sunlight,wind and...
As there is less and less coal and oil,scientists are explor
As there is less and less coal and oil,scientists are exploring new ways of making use of ______ energy,such as sunlight,wind and water for power and fuel.
A.primary B.alternative C.instant D.unique
怎么理解
els163
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根据意思看选B,随着煤和石油的数量减少,科学家在寻找替代能源,例如太阳能,风能和水能.只有alternative有另一种,另外,其他的意思.所以选B.
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